CN105937441B - Internal combustion engine - Google Patents
Internal combustion engine Download PDFInfo
- Publication number
- CN105937441B CN105937441B CN201610096561.5A CN201610096561A CN105937441B CN 105937441 B CN105937441 B CN 105937441B CN 201610096561 A CN201610096561 A CN 201610096561A CN 105937441 B CN105937441 B CN 105937441B
- Authority
- CN
- China
- Prior art keywords
- flange
- boss
- chain guard
- cylinder head
- cam shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 description 11
- 230000037431 insertion Effects 0.000 description 11
- 238000007789 sealing Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/022—Chain drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
- F02F7/0073—Adaptations for fitting the engine, e.g. front-plates or bell-housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
- F02F7/0073—Adaptations for fitting the engine, e.g. front-plates or bell-housings
- F02F2007/0075—Front covers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The present invention provides a kind of internal combustion engines comprising cylinder head, bent axle, admission cam shaft and exhaust cam shaft, the first chain guard and the second chain guard, chain and fastening bolt.The first chain guard with notch includes the first flange and first boss, and the first flange is located at the certain edges thereof edge between bent axle and camshaft of notch, and the axle portion of fastening bolt passes through first boss.Cylinder head includes the second flange and second boss, and second boss is coaxially disposed with first boss, and the axle portion is inserted into second boss.Liquid gasket is maintained between the second flange and the first flange.It is provided with slot at least one of position between the first flange and first boss of the first chain guard and the position between the second flange and second boss of cylinder head.
Description
Technical field
The present invention relates to the internal combustion engines that chain guard is fastened to cylinder head by fastening bolt.
Background technology
Japanese Patent Application No.2012-137044 (JP 2012-137044A) describes one kind and passing through fastening bolt
Chain guard is fastened to the example of the internal combustion engine of cylinder head.In this internal combustion engine, the rotation of bent axle is transferred to convex
The chain of wheel shaft is arranged in the space being defined between cylinder head and chain guard.
In certain internal combustion engines, the first chain guard and the second chain guard are fastened to by cylinder head by fastening bolt.For example,
First chain guard is attached to cylinder head, and the second chain guard is attached to the first chain guard.Chain setting is being defined in the first chain guard and second
In space between chain guard.
In this internal combustion engine, such as formed-in-place gasket can be set between the first chain guard and cylinder head
(FIPG) etc liquid gasket.
It is contacted to avoid with camshaft more specifically, the first chain guard is provided with notch, camshaft is along its axial direction from gas
Cylinder cap protrudes.Due to the notch disposed as described above in the first chain guard, a part for the periphery of the first chain guard is located in song
Between axis and camshaft.The part of the periphery of first chain guard --- that is, being located in the portion between bent axle and camshaft
Point --- " certain edges thereof edge " will be referred to as.It is provided with flange at the certain edges thereof edge of the first chain guard.In addition, in cylinder head
A part of --- that is, part towards the certain edges thereof edge --- place is provided with flange.It is plugged with liquid between these flanges
Gasket.Liquid gasket is in close contact with these flanges.Therefore, the sealing performance in the region between these flanges is increased
By force.
When chain guard is fastened to cylinder head by fastening bolt, the periphery of the first chain guard is removed because being set in the first chain guard
Edge part other than setting notch and the edge part that is formed is pressed by the periphery of the second chain guard towards cylinder head, but the first chain guard
Certain edges thereof edge is not pressed by the second chain guard towards cylinder head.Therefore, it is not that keep the power of liquid gasket by flange
It is big.This makes it difficult to the degree of the close contact between enhancing flange and liquid gasket.Accordingly, it is difficult to enhance these flanges
Between region sealing performance.
In order to enhance the sealing performance in the region between flange, it is desirable to boss be arranged near each flange, make tight
The axle portion of fixing bolt passes through the boss.Therefore, the axial force generated by tightening fastening bolt is passed to liquid airproof
Pad.Which increase the power that liquid gasket is kept by flange.Therefore, the degree of intimate contact between liquid gasket and flange
It is enhanced, so as to cause the sealing performance for enhancing the region between flange.
Next, will be to each chain guard is fastened to cylinder head the step of, is described.In the first step, to the first chain
At least one of the flange of cover and the flange of cylinder head apply uncured liquid gasket and are attached to the first chain guard
Cylinder head.In the second step, chain link is sleeved on bent axle and camshaft.In third step, the second chain guard is attached to
One chain guard.In four steps, chain guard is fastened to cylinder head by tightening fastening bolt.
Invention content
In the case where chain guard is fastened to cylinder head by multiple steps as described above, certainly at least one of which
Flange applies liquid airproof and paves after specific a period of time, and chain guard is fastened to cylinder head by fastening bolt.It changes
Sentence is talked about, and in some cases, is that the liquid gasket that at least one of which flange is applied in first step starts to cure
Later, chain guard is fastened to by cylinder head by fastening bolt in four steps.In this case, above-mentioned axial force is passed
To hard liquid gasket.When being provided with boss near each flange, being transferred to the axial force of hydraulic seal pad became
Greatly, so as to causing the durability of liquid gasket to reduce.
The liquid for being transferred to and being kept by flange can be reduced by reducing the tightening force generated because tightening fastening bolt
The axial force of gasket.However, in this case, although inhibiting the reduction of the durability of liquid gasket, by chain
The power that cover is fixed to cylinder head is also reduced.
The present invention provides a kind of internal combustion engine, which is configured so as to reduce by tightening
The reduction of the durability of liquid gasket is inhibited in the case of the tightening force that fastening bolt generates.
Internal combustion engine according to an aspect of the present invention include cylinder head, bent axle, admission cam shaft, exhaust cam shaft,
First chain guard, the second chain guard, chain and fastening bolt.The admission cam shaft and the exhaust cam shaft are arranged in the cylinder head
In.First chain guard is arranged to contact with the cylinder head.Second chain guard is arranged to contact with first chain guard.Institute
Chain link is stated to be sleeved on the bent axle, the admission cam shaft and the exhaust cam shaft.The chain is arranged by first chain
In the space that cover and second chain guard limit.First chain guard and second chain guard are fastened to institute by the fastening bolt
State cylinder head.First chain guard includes edge part, and the edge part limits notch so that the admission cam shaft and the row
Gas camshaft is located in the space in the notch.A part for the peripheral part of the notch is is located in the bent axle and institute
State the certain edges thereof edge between admission cam shaft and the exhaust cam shaft.First chain guard includes that the first flange and first are convex
Platform, first flange are located at the certain edges thereof edge, and the axle portion of the fastening bolt passes through the first boss.It is described
First boss is arranged adjacent to first flange, and the first boss is located at crankshaft side relative to first flange
On.The cylinder head includes the second flange and second boss, and second flange is cooperateed with first flange with liquid is close
The mode that packing is maintained between second flange and first flange keeps the liquid gasket, the fastening bolt
The axle portion be inserted into the second boss.The second boss is coaxially disposed with the first boss.Described
Second flange of position and the cylinder head between first flange of one chain guard and the first boss and institute
It states at least one of position between second boss and is provided with slot.
According to the above, during the first chain guard, chain and the second chain guard are attached to cylinder head, first, to
At least one of one flange and the second flange apply also uncured liquid gasket and the first chain guard are attached to cylinder head.
Even if in the case where the first chain guard is attached to cylinder head by this method, the notch in the first chain guard, which is arranged, still prevents from gas
Cylinder cap camshaft outstanding is contacted with the first chain guard.In addition, being applied to the liquid of at least one of the first flange and the second flange
State gasket is maintained between the first flange and the second flange.Then, chain link is sleeved on bent axle and camshaft.In this situation
Under, the second chain guard is attached to the first chain guard.Then, chain guard is fastened to by cylinder head by fastening bolt.
In this case, the stage before chain guard is fastened to cylinder head by fastening bolt, be plugged on flange it
Between liquid gasket may have begun to cure.When fastening bolt is tightened in this condition, if being applied to hard liquid
The axial force of state gasket is excessive, then the durability of liquid gasket may reduce.
In consideration of it, according to the above, although first boss is positioned very close to the first flange and second boss is leaned on very much
Nearly second flange positioning, but between the position and the second flange and second boss between the first flange and first boss
At least one of position place is provided with slot.Therefore, it or even is inserted into boss in the axle portion of fastening bolt and therefore generates
When axial force, transmission of the axial force to liquid gasket is limited still through slot.In other words, it prevents from being transferred to liquid airproof
The axial force of pad is excessive, and therefore, and liquid gasket is less likely damage.Therefore, need not reduce by tightening fastening
In the case of the tightening force that bolt generates, it is suppressed that the reduction of the durability of liquid gasket.
In the internal combustion engine according to the above, the first boss and the second boss can be in the air inlets
Be located on the direction that camshaft and the exhaust cam shaft are arranged side by side the admission cam shaft and the exhaust cam shaft it
Between.According to this aspect, the axial force by tightening fastening bolt generation be passed to be located in the first flange and the second flange it
Between wholly liquid state gasket.Therefore, it is easy to ensure that the sealing performance provided by flange and liquid gasket.
In the internal combustion engine according to the above, the width of the slot can be less than the peripheral wall of the first boss with
And the width of each of peripheral wall of the second boss.According to this aspect, pass through the axis generated because tightening fastening bolt
The degree of intimate contact between flange and liquid gasket is set to be enhanced to power.
Description of the drawings
It anticipates below with reference to accompanying drawings to the feature, advantage of exemplary embodiments of the present invention and technical meaning and industry
Justice is described, and in the accompanying drawings, identical reference numeral indicates identical element, and in the accompanying drawings：
Fig. 1 is the side view for schematically showing the internal combustion engine according to embodiment；
Fig. 2 is the front view of internal combustion engine；
Fig. 3 A are the plan view for schematically showing the first chain guard；
Fig. 3 B are the sectional view along the line 3B-3B interceptions of the first chain guard；
Fig. 4 A are the plan view on the attaching surface for the first chain guard of attaching for schematically showing cylinder head；
Fig. 4 B are the partial enlarged view of cylinder head；
Fig. 5 is the plan view for schematically showing the second chain guard；
The schematic diagram of internal combustion engine when Fig. 6 is viewed from above, wherein housing is omitted；And
Fig. 7 is to show that the part for the state that chain guard is fastened to in internal combustion engine by fastening bolt cylinder head is cut
Face figure.
Specific implementation mode
It hereafter, will be referring to Figure 1 to Figure 7 to being described according to the internal combustion engine of embodiment.Such as institute in Fig. 1 and Fig. 2
Show, internal combustion engine 10 includes cylinder block 11, cylinder head 12 and valve mechanism cover 13, wherein cylinder head 12 is fastened to cylinder block 11
Upper part (in fig. 1 and 2), valve mechanism cover 13 cover cylinder head 12 upper part (in fig. 1 and 2).Internal combustion
Engine 10 is provided with the bent axle 14 supported in a rotatable way by cylinder block 11 and by cylinder head 12 with rotatable side
The admission cam shaft 15 and exhaust cam shaft 16 of formula bearing.Loop chain 17 is relative to cylinder block 11 at right side (in Fig. 1) position
Ring set is on bent axle 14 and camshaft 15,16.By this configuration, the rotation of bent axle 14 by chain 17 be transferred to camshaft 15,
16。
Internal combustion engine 10 is provided with the first chain guard 18 for being attached to cylinder head 12 and cylinder block 11 and is attached to first
Second chain guard 19 of chain guard 18.Chain guard 18,19 is fastened to cylinder head 12 by fastening bolt 20.Chain 17 setting by chain guard 18,
In 19 spaces limited.
It is provided with mounting bracket 21 on the side opposite with the first chain guard 18 of chain guard 19.Fastening bolt 20 passes through peace
The slightly end for filling the axle portion 201 of holder 21 extends to cylinder head 12, and chain guard 18,19 is thus fastened to cylinder head 12.In this shape
Under state, the head 202 of fastening bolt 20 is engaged with mounting bracket 21.By means of the tension for tightening the generation of fastening bolt 20
Power, the second chain guard 19 is pressed against the first chain guard 18, and the first chain guard 18 is pressed against cylinder head 12.
Next, will be described with reference to the first chain guards of Fig. 3 A and Fig. 3 B couple 18.Fig. 3 A show the interior of the first chain guard 18
Surface 31.Inner surface 31 is towards cylinder block 11 and cylinder head 12.
As shown in fig. 3, the low portion (in figure 3 a) of the first chain guard 18 has through-hole 32, bent axle 14 logical across this
Hole 32.The low portion of first chain guard 18 is the part for being attached to cylinder block 11.In addition, under the inner surface 31 of the first chain guard 18
The flange 33 for cylinder block is provided in portion part (in Fig. 3 A).Flange 33 has closed loop shape.In the slightly end of flange 33
Place is provided with the exemplary formed-in-place gasket (FIPG) as liquid gasket.When the first chain guard 18 is attached to cylinder block 11
When with cylinder head 12, the flange 33 for being applied with FIPG is pressed against cylinder block 11.
In addition, the upper part of the first chain guard 18 is provided with restriction for avoiding the first chain guard 18 and cam (in figure 3 a)
The edge part 35 for the notch 34 that axis 15,16 contacts.The upper part of first chain guard 18 is to be attached to the part of cylinder head 12.It limits
The edge part 35 of notch 34 is located in the center of the upper part (in figure 3 a) of the first chain guard 18.When the first chain guard 18 is attached to
When cylinder block 11 and cylinder head 12, camshaft 15,16 is located in the space 341 within the edge part 35 for limiting notch 34
In.
Since notch 34, a part for the periphery of the first chain guard 18 are provided in the first chain guard 18 as described above
It is located between bent axle 14 and camshaft 15,16.In the periphery of the first chain guard 18, since notch is arranged in the first chain guard 18
34 and the edge part that is formed in the first chain guard 18 will be often simply referred to as " edge part 35 " in this specification.In such case
Under, a part for edge part 35 --- that is, the portion extended transversely at position between bent axle 14 and camshaft 15,16
Point --- correspond to " certain edges thereof edge 35A ".
On the inner surface 31 of the first chain guard 18, it is convex at the edge part 35 including certain edges thereof edge 35A to be provided with first
Edge 36.First flange 36 is different from flange 33, does not have closed loop shape.
As shown in figures 3 a and 3b, the multiple insertion sections 37 being inserted through for positioning bolt 22 are provided with, it is multiple to insert
Enter portion 37 to be arranged to protrude from the inner surface 31 of the first chain guard 18.Insertion section 37 to make the first chain guard 18 with cylinder head 12 each other
Alignment.Insertion section 37 and the first flange 36 are integral, and the slightly end for slightly holding end face and the first flange 36 of each insertion section 37
Surface flushes.
As shown in figures 3 a and 3b, the inner surface 31 of the first chain guard 18 is provided with first boss 38, fastening bolt 20
Axle portion 201 passes through first boss 38.The slightly end end face for slightly holding end face and the first flange 36 of first boss 38.When by air inlet
When the direction that camshaft 15 is arranged side by side with exhaust cam shaft 16 is limited to prescribed direction, first boss 38 is fixed in the prescribed direction
Position between admission cam shaft 15 and exhaust cam shaft 16, and first boss 38 adjacent to the first flange 36 setting in certain edges thereof
Part at the 35A of edge.First boss 38 is located in relative to certain edges thereof edge 35A on 14 side of bent axle (downside in Fig. 3 A).
The first slot 39 is defined between the first flange 36 and first boss 38.The width H1 of first slot 39 is very small and is less than first
The width H2 of the peripheral wall 381 of boss 38.In other words, first boss 38 is positioned close to the first flange 36.
Apply still during the first chain guard 18 is attached to cylinder head 12, such as to the slightly end end face of the first flange 36
Uncured FIPG 23.FIPG 23 is used as the example of " liquid gasket ".FIPG be apply when in liquid form and from
Cured material as time goes by after application.Due to the application of FIPG, one can be bonded in by being applied with the part of FIPG
It rises and intimate contact with one another.
Next, by the attaching surface 51 for the first chain guard of attaching 18 for describing cylinder head 12 with reference to Fig. 4 A and Fig. 4 B.Such as figure
Shown in 4A, the attaching surface 51 of cylinder head 12 is disposed an outwardly facing the second flange 52 of the first flange 36 of the first chain guard 18.It changes
Sentence is talked about, and when the first chain guard 18 is attached to cylinder head 12, the second flange 52 cooperates with the first flange 36 keeps FIPG 23, makes
FIPG 23 is obtained to be maintained between the second flange 52 and the first flange 36.In addition, attaching surface 51 is provided with and the first chain guard 18
The insertion section 53 that is coaxially disposed of insertion section 37.Insertion section 53 and the second flange 52 are integral, and each insertion section 53
Slightly hold the slightly end end face of end face and the second flange 52.The slightly end of positioning bolt 22 is inserted into the insertion section on attaching surface 51
In 53.
As shown in Figure 4 A and 4 B, it is provided with second boss 54 near second flange 52 on attaching surface 51.Second
Boss 54 is adjacent to the second flange 52, and second boss 54 and the first boss 38 of the first chain guard 18 are coaxially disposed.Fasten spiral shell
The axle portion 201 of bolt 20 is inserted into second boss 54.The width H3 of the peripheral wall 541 of second boss 54 is equal to the week of first boss 38
The width H2 of wall 381.
In the present embodiment, the second slot 55 is provided between the second flange 52 and second boss 54.Second slot 55
Width H4 is substantially equal to the width H1 of the first slot 39.When the first chain guard 18 is attached to cylinder head 12, the inside of the second slot 55 with
The inside of first slot 39 communicates with each other.
Next, will be described with reference to Fig. 5 pairs of the second chain guard 19.Fig. 5 shows the inner surface 61 of the second chain guard 19.It is interior
Surface 61 is towards the first chain guard 18.
As shown in Figure 5, the second chain guard 19 has the through-hole 62 passed through for bent axle 14, for the through-hole of admission cam shaft 15
63 and for exhaust cam shaft 16 through-hole 64.In addition, the inner surface 61 of the second chain guard 19 is provided with third flange 65.Third
Flange 65 is arranged at the edge part in addition to upper edge (in Figure 5) of the periphery of the second chain guard 19.When the second chain guard 19
When being attached to the first chain guard 18, third flange 65 is contacted with the edge part in addition to edge part 35 of the periphery of chain guard 18.Change sentence
It talks about, the second chain guard 19 is not provided with the flange contacted with the edge part 35 of the first chain guard 18.
In addition, the inner surface 61 of the second chain guard 19 is provided with third boss 66, the axle portion 201 of aforementioned fastening bolt 20 passes through
Third boss 66.Third boss 66 and the first boss 38 of the first chain guard 18 are coaxially disposed.
Next, by being carried out referring to figure 6 and figure 7 to the operation that chain guard 18, each of 19 is fastened to cylinder head 12
Description.First, apply still at least one of the first flange 36 of the first chain guard 18 and the second flange 52 of cylinder head 12
Uncured FIPG 23.In this state, the first chain guard 18 is attached to cylinder head 12.At this point, positioning bolt 22 is inserted into
Into the insertion section 37 of the first chain guard 18 and the insertion section 53 of cylinder head 12.In this case, it is maintained at the first flange 36
FIPG 23 between the second flange 52 is still uncured.Therefore, or even in the case where positioning bolt 22 is tightened, FIPG 23
Also it is almost not corrupted.
Then, by 17 ring set of chain on bent axle 14 and camshaft 15,16.Next, the second chain guard 19 is attached to first
Chain guard 18 is so that chain 17 is covered by the first chain guard 18 and the second chain guard 19.
Then, as shown in Figure 6, chain guard 18,19 is fastened to by cylinder head 12 by fastening bolt 20.In such case
Under, the head 202 of fastening bolt 20 is engaged with mounting bracket 21, and therefore, by mounting bracket 21 by 19 court of the second chain guard
It is pressed to the first chain guard 18.In this state, by the periphery of the second chain guard 19 by the main portion of the periphery of the first chain guard 18
--- that is, part in addition to edge part 35 of the periphery of the first chain guard 18 --- is divided to be pressed towards cylinder head 12.
As shown in Figure 7, the inner surface 31 of the edge part 35 of the first chain guard 18 is provided with the first flange 36, and first is convex
Edge 36 faces the second flange 52 of cylinder head 12 across FIPG 23.The axle portion 201 of fastening bolt 20 is inserted into respectively close to first
In flange 36 and the first boss 38 and second boss 54 of the setting of the second flange 52.Therefore, it is generated by tightening fastening bolt 20
Axial force be passed to the FIPG 23 being maintained between the first flange 36 and the second flange 52.
FIPG has starts cured characteristic as time goes by.Therefore, it when fastening bolt 20 is tightened, is located in
The solidification of FIPG 23 between first flange 36 and the second flange 52 may have begun.When in FIPG 23 just in cured feelings
When tightening fastening bolt 20 under condition, if the axial force for being transferred to FIPG 23 is excessive, because to be maintained at first convex by FIPG 23
Become larger between edge 36 and the second flange 52 and to damage caused by FIPG 23, this may cause the durability of FIPG 23 to reduce.
In consideration of it, in the present embodiment, the first slot 39 is provided between the first flange 36 and second boss 38, and
The second slot 55 is provided between the second flange 52 and second boss 54.Therefore, the first chain guard 18 be located at the first flange 36 with
The rigidity of part between first boss 38 and the part between the second flange 52 and second boss 54 of cylinder head 12
Rigidity all reduce.Therefore, even if tightening fastening bolt 20 in the case of FIPG 23 is curing, by tightening fastening spiral shell
The axial force that bolt 20 generates also is less likely to be transmitted to FIPG 23.It is therefore prevented that the axial force for being transferred to FIPG 23 is excessive,
And therefore FIPG 23 is less likely to be damaged.
Above-mentioned configuration and operation produce following advantageous effects.(1) or even in the axle portion 201 because of fastening bolt 20 it is inserted into
When generating axial force in boss 38,54, the transmission of the axial force to FIPG 23 is also limited by slot 39,55.Therefore, it is suppressed that
Excessive axial force is transmitted to FIPG 23.In other words, or even when boss 38,54 is arranged respectively close to flange 36,52, still
So axial force appropriate is transmitted to FIPG 23 and FIPG 23 is therefore made to be in close contact with flange 36,52.It therefore, can be true
The reduction for inhibiting the durability of FIPG 23 while the sealing performance provided by 36,52 and FIPG of flange 23 is provided, without
Reduce by tightening tightening force caused by fastening bolt 20.
(2) when the direction that camshaft 15,16 is arranged side by side is limited to prescribed direction, first boss 38 and second boss
54 are arranged close to the center in the prescribed direction of the first flange 36.Therefore, the axial force generated by tightening fastening bolt 20
It is passed to the entire FIPG 23 being located between the first flange 36 and the second flange 52.Therefore, it is easy to ensure that by flange 36,
The sealing performance that 52 and FIPG 23 is provided.
The above embodiment can be changed as follows.As long as being provided between the first flange 36 and first boss 38
As soon as slot 39, then the second slot 55 need not be arranged between the second flange 52 and second boss 54.Equally, it compares in the first flange
The case where being not provided with slot between 36 and first boss 38 and being not provided with slot between the second flange 52 and second boss 54,
In this case, the possibility of axial force transmission to FIPG 23 are lower.Therefore, can ensure by 36,52 and FIPG of flange
The reduction of the durability of FIPG 23 is provided while the sealing performance of 23 offers.
As long as being provided with the second slot 55 between the second flange 52 and second boss 54, then need not be in the first flange 36
First slot 39 is set between first boss 38.Equally, it is not provided with slot compared between the first flange 36 and first boss 38
And the case where being not provided with slot between the second flange 52 and second boss 54, in this case, axial force transmission to FIPG
23 possibility smaller.Therefore, can inhibit while the sealing performance provided by 36,52 and FIPG of flange 23 is provided
The reduction of the durability of FIPG 23.
In the above-described embodiment, FIPG is used as liquid gasket.However, liquid gasket is not limited to FIPG, and
The other materials in addition to FIPG may be used in it, if these materials apply when in the form of liquid and from apply after with
The passage of time cure and these materials so that the part for being applied with these materials is bonded together and make these parts that
This is in close contact.
Claims (3)
1. a kind of internal combustion engine, including：
Cylinder head；
Bent axle；
Admission cam shaft and exhaust cam shaft, the admission cam shaft and the exhaust cam shaft are arranged in the cylinder head；
First chain guard, first chain guard are arranged to contact with the cylinder head；
Second chain guard, second chain guard are arranged to contact with first chain guard；
Chain, the chain link are sleeved on the bent axle, the admission cam shaft and the exhaust cam shaft, and the chain is arranged by institute
It states in the space that the first chain guard and second chain guard limit；And
First chain guard and second chain guard are fastened to the cylinder head by fastening bolt, the fastening bolt, wherein
First chain guard includes edge part, and the edge part limits notch so that the admission cam shaft and the exhaust are convex
Wheel shaft is located in the space in the notch,
A part for the peripheral part of the notch is to be located in the bent axle and the admission cam shaft and the exhaust cam shaft
Between certain edges thereof edge,
First chain guard includes the first flange and first boss, and first flange is located at the certain edges thereof edge, institute
The axle portion for stating fastening bolt passes through the first boss, the first boss to be arranged adjacent to first flange, and described
First boss is located at relative to first flange in crankshaft side,
The cylinder head includes the second flange and second boss, and second flange is cooperateed with first flange with liquid is close
The mode that packing is maintained between second flange and first flange keeps the liquid gasket, the fastening bolt
The axle portion be inserted into the second boss, the second boss is coaxially disposed with the first boss, and
Described in position and the cylinder head between first flange of first chain guard and the first boss
It is provided with slot at least one of position between second flange and the second boss.
2. internal combustion engine according to claim 1, wherein the first boss and the second boss are in the air inlet
Be located on the direction that camshaft and the exhaust cam shaft are arranged side by side the admission cam shaft and the exhaust cam shaft it
Between.
3. internal combustion engine according to claim 1 or 2, wherein the width of the slot is less than the week of the first boss
The width of each of wall and the peripheral wall of the second boss.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015040424A JP6156412B2 (en) | 2015-03-02 | 2015-03-02 | Internal combustion engine |
| JP2015-040424 | 2015-03-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105937441A CN105937441A (en) | 2016-09-14 |
| CN105937441B true CN105937441B (en) | 2018-09-04 |
Family
ID=56846576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610096561.5A Expired - Fee Related CN105937441B (en) | 2015-03-02 | 2016-02-22 | Internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US9771836B2 (en) |
| JP (1) | JP6156412B2 (en) |
| CN (1) | CN105937441B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3619415A4 (en) | 2017-05-15 | 2020-12-16 | Cummins Inc. | Cylinder head bolt boss cutouts |
| JP6939485B2 (en) * | 2017-12-04 | 2021-09-22 | トヨタ自動車株式会社 | cylinder head |
| DE102018113977A1 (en) * | 2018-06-12 | 2019-12-12 | ECO Holding 1 GmbH | Camshaft unit and method for producing a camshaft unit |
| JP7480682B2 (en) * | 2020-11-17 | 2024-05-10 | トヨタ紡織株式会社 | Internal combustion engine cover |
| JP7312209B2 (en) * | 2021-03-31 | 2023-07-20 | 本田技研工業株式会社 | internal combustion engine |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61179351U (en) * | 1985-04-30 | 1986-11-08 | ||
| JPS61183445U (en) * | 1985-05-08 | 1986-11-15 | ||
| JPH0672548B2 (en) * | 1986-04-23 | 1994-09-14 | マツダ株式会社 | V-type engine cylinder head structure |
| JPH1047158A (en) * | 1996-07-31 | 1998-02-17 | Suzuki Motor Corp | Chain cover structure of internal combustion engine |
| JP4122109B2 (en) * | 1999-05-31 | 2008-07-23 | 本田技研工業株式会社 | Parts mounting structure |
| JP2001090840A (en) * | 1999-09-24 | 2001-04-03 | Honda Motor Co Ltd | Sealing device |
| JP2009293378A (en) * | 2008-06-02 | 2009-12-17 | Toyota Motor Corp | Seal structure of chain case joining surface |
| JP2012137044A (en) | 2010-12-27 | 2012-07-19 | Suzuki Motor Corp | Fixing structure of chain case for engine |
| JP5592866B2 (en) * | 2011-11-25 | 2014-09-17 | 本田技研工業株式会社 | Cover structure of internal combustion engine |
| JP5940002B2 (en) * | 2013-02-14 | 2016-06-29 | 日立オートモティブシステムズ株式会社 | Valve timing control system for internal combustion engine |
-
2015
- 2015-03-02 JP JP2015040424A patent/JP6156412B2/en active Active
-
2016
- 2016-02-19 US US15/047,958 patent/US9771836B2/en active Active
- 2016-02-22 CN CN201610096561.5A patent/CN105937441B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US9771836B2 (en) | 2017-09-26 |
| US20160258328A1 (en) | 2016-09-08 |
| JP6156412B2 (en) | 2017-07-05 |
| CN105937441A (en) | 2016-09-14 |
| JP2016160833A (en) | 2016-09-05 |
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